Pneumatic tool.



No. 676,055. Patented lune u, I90l. .1. .1. TYNAN.

PNEUMATIC TOOL.

(Application filed Sept. 22, 1900.)

(No Model.)

L] LJ WMA/e/o 9mm- 72g 16 m $3. M-

UNITED STATES PATENT OFFICE.

JOSEPII J. TYNAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE PNEUMATIC TOOL IMPROVEMENT COMPANY, OF SAME PLACEAND CAMDEN, NEW JERSEY.

PNEUMATIC TOOL.

SPECIFICATION formingpart of Letters Patent No. 676,055, dated June 11,1901.

Application filed September 22, 1900. Serial No. 30,813. (No model.)

To (LZZ whom it may concern:

Be it known that I, JOSEPH J. TYNAN, a citizen of the United States, anda resident of the city and county of Philadelphia, State ofPennsylvania, have invented certain new and useful Improvements inPneumatic Tools, of which the following is a specification.

My invention relates to improvements in pneumatic tools, and moreparticularly to improvements in the valves of pneumatic tools, theobject of my invention being to furnish means whereby the tension on thereciprocating valve may be adjusted to take up wear and prolong its lifeand usefulness.

As heretofore constructed the valves in question have been made to fitthe casing very closely-in fact, to bind lightly against the casing, butnot so tightly as to interfere with their action when the fluid underpressure operated upon them. So long as the valve was tight when newthis construction would operate perfectly well; but in a very short timethe valve would work loose. Also, if the valve was fitted loosely whennew, the tool being held in some positions it would fall too low downand fail to operate, necessitating the refitting or renewal of the valvebefore the tool could again be used.

It is the purpose of my invention to furnish means whereby the frictionagainst the valve may be regulated from time to time, as may benecessary to prevent it from falling from place.

In the accompanying drawings, forming part of this specification, and inwhich similar letters of reference indicate similar parts throughout theseveral views, Figure 1 is a side elevation of a pneumatic-valve casingfitted with my improvements; Fig. 2, a plan of Fig. 1; Fig. 3, a sectionof Fig. 2 on line A B; Fig. 4, a section of the valve-casingcorresponding to that shown in Fig. 3, the valve being omitted and africtional ring being shown which is adapted to bind against the valve;Fig. 5, a side elevation of the valve; Fig. 6, a plan of the ring shownin Fig. 4;

Fig. 7, a section of Fig. 0 on line C D; Fig. 8, an enlarged sectionthrough part of the valvecasing, showing the preferred means foradjusting the friction on the valve.

(1 is the valve-casing, and I) the reciprocating valve. Both these partsare of the usual construction and will not need detailed description. InFigs. 1, 2, 3, and 8 the valvecasing is bored through in three places atone hundred and twenty degrees apart, preferably as shown at c c c. Theouter portions of holes 0 are tapped to receive short screws (Z, and theinner ends of these holes carry headed pins 6, which are normally forcedinward by a springf, one end of which bears against the inner end ofscrew d and the other against the outer side of the head or shoulder onpin e. By setting screws (Z in or out the tension of springsf may beregulated so as to cause pins f to bear with any desired pressureagainst the valve 19.

Instead of the arrangement shown and described in connection with Figs.1, 2, 3, and 8 a split ring 9, carried in a groove in the easing a, maybe used to bind against the Valve in order to furnish the frictionnecessary to keep this latter in place.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination with the reciprocating valve andthe valve-casing of a pneumatic tool, of means carried by the casingwhereby the friction between the valve and the casing may be adjustedfor the purposes set forth.

2. The combination with the reciprocating valve and the valve-casing ofa pneumatic tool, of pins carried by the casing adapted to engage thesides of the valve, springs normally forcing said pins inward, andscrews carried by the casing by means of which the tension of saidsprings may be adjusted.

JOSEPH J. TYNAN. lVitnesses:

F. J. TUCKER, JOHN H. SEIEERT.

